A capacitor consisting of two parallel plates, separated by a distance d is init
ID: 1872405 • Letter: A
Question
A capacitor consisting of two parallel plates, separated by a distance d is initially charged to a voltage of 4.6 V. The battery is then disconnected from the capacitor for eacit statensienti gewwsepeact lel p oar eaise.parated by a distance d is initaly charged to a voltage of 4.6 V. The battery is then d Decreasing the distance d after disconnecting the battery will decrease the electrical energy stored in the capacitor. A: TrueB: False If the battery is disconnected, and then the distance d between the plates is decreased, the amount of charge stored on either plate of the capacitor will change A: TrueB: False If the battery is disconnected, and then the distance d between the plates is decreased, the voltage across the capacitor will increase A: True B: False Sutarit AnawerTries 0/2Explanation / Answer
Remember and apply for parallel plate caapcitor, these as formulas
1. Capacitance C = K eoA/d
where K is dieelctric constant ( for air K = 1)
eo is permnittivity constant = 8.85 e-12
A is area = pi^2 ( for circular plates) and l* b for rectanular plates
and
d is the distance between the plates
2.Charge Q = CV
where V is potrntial difference
3. energy stored U = 0.5 QV
= 0.5 CV^2 or 0.5 Q^2/C
4. electric field between the plates is E = Q/eo A
( also given by E = V/d)
so here we get after appling
If the battery is disconnected, and then the distance d between the plates is decreased, the voltage across the capacitor will increase - False
If the battery is disconnected, and then the distance d between the plates is decreased, the amount of charge stored on either plate of the capacitor will change - True
Decreasing the distance d after disconnecting the battery will decrease the electrical energy stored in the capacitor - False
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